Collateral Finance and Securitization Notes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2006
Collateral Finance Facility [Line Items]
Debt Instrument, Face Amount				$ 850,000,000
Direct investment in subsidiary				$ 113,000,000
Assets Held-in-trust	$ 0	$ 465,000,000
Amount Held In Debt Service Coverage Account	0	39,000,000
Collateral Financing Expense	7,000,000	12,000,000	$ 17,000,000
Debt Issuance Cost	32,000,000	28,000,000
Timerberlake Financial [Member]
Collateral Finance Facility [Line Items]
Collateral Financing Expense	$ 2,000,000	$ 1,000,000	$ 3,000,000